The Research Of AC-DC-AC Matrix Converter Based On Boost And Buck-Boost Inverter

Matrix Converter(MC) is a kind of"green converter"with simple topology and a series of ideal characteristics, and a key technique to eliminate power harmonic pollution and grid inefficacy power waste basically. In this paper the problem of MC lower voltage transfer ratio is studied which is the key basic problem baffling MC application. Though some researchers and experts proposed overmodulation control strategy to increase MC transfer ratio and made it near to 1.0, its output harmonic connects was too high to be good for application. Another method of raising MC voltage transfer ratio in"Research on voltage transmission characteristic of matrix converter based on harmonic injection method"also can increase transfer ratio to 1.0 but flow of high harmonic components existed either. According to study on changing control strategy, the effects were not good enough and presented high harmonics.Contraposing to above problem, this paper proposes novel MC topologies based on Boost and Buck-Boost in terms of varying MC main circuit topology, which are similar to conventional AC-DC-AC MC adopting AC-DC-AC two-stage construct without energy storage elements in middle DC link. Its rectifier stages are the same as conventional MC which are 3/2 phase MC, while inverter stages adapt Boost and Buck-Boost inverter construct forms, respectively. The problem of low voltage transfer ratio of conventional MC is settled effectively due to these novel MCs can realize discretional regulation of voltage transfer ratio and output frequency and its voltage transfer ratio can be higher or lower than 1.0. Main circuit schemes and parameters are fixed on through researching its topologies and equivalent circuits. Effective control strategies suitable for these novel circuits are studied based on present theoretical harvest of MC, Boost and Buck-Boost inverters. The variety relationship between main characteristics such as voltage transfer ratio, output waveform total harmonic distortion and circuit and control parameters is summed up. Experimental sample device is designed to provide inspiration for these novel MCs further engineering application.